That's just it, though: a lot of HK cinema follows these same patterns. Sleeping Dogs doesn't try to reinvent what an HK cinema story might be, it just follows the tropes religiously and, in doing so, resonates with fans of the genre.
I also think the game doesn't get enough credit for some of the more clever innovations it incorporates. The fact that there's competent gunplay AND mêlée, AND manages to keep the mêlée relevant by limiting gun access overall, that's impressive when you consider the scale of the game. The use of shops' comestibles and purchasable outfits to improve stats was clever, but I would have enjoyed just a little more effect from them.
It's also stunning, as mentioned, that the game turned out this well despite its lengthy stay in "development hell."